<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"
        >分辨率不能大于1920*1920,大小不超过
        <b style="color: #f56c6c">{{ fileSize }}KB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
      :close-on-click-modal="false"
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import * as imageConversion from "image-conversion";

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 400,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      fileName: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                if (item.indexOf("http") == -1) {
                  item = {
                    name: this.baseUrl + item,
                    url: this.baseUrl + item,
                  };
                } else {
                  item = { name: item, url: item };
                }
              } else {
                item = { name: item, url: item };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前loading加载
    // handleBeforeUpload(file) {
    //   let isImg = false;
    //   if (this.fileType.length) {
    //     let fileExtension = "";
    //     if (file.name.lastIndexOf(".") > -1) {
    //       fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    //     }
    //     isImg = this.fileType.some(type => {
    //       if (file.type.indexOf(type) > -1) return true;
    //       if (fileExtension && fileExtension.indexOf(type) > -1) return true;
    //       return false;
    //     });
    //   } else {
    //     isImg = file.type.indexOf("image") > -1;
    //   }

    //   if (!isImg) {
    //     this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
    //     return false;
    //   }
    //   if (this.fileSize) {
    //     const isLt = file.size / 1024  < this.fileSize;
    //     if (!isLt) {
    //       this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} KB!`);
    //       return false;
    //     }else{
    //       this.$modal.loading("正在上传图片，请稍候...");
    //       this.number++;
    //     }
    //   }
    //   const isSize = new Promise(function(resolve, reject) {
    //   const _url = URL.createObjectURL(file)
    //   const img = new Image()
    //   if (1) { // 是否判断宽高
    //     img.onload = function() {
    //     const valid = img.width <=1920 && img.height<=1920
    //     valid ? resolve() : reject()
    //     }
    //   } else {
    //     resolve()
    //   }
    //     img.src = _url
    //   }).then(() => {
    //     return true
    //   }, () => {
    //   this.$message.error('上传头像图片分辨率不能大于1920*1920')
    //   this.$modal.closeLoading();
    //   return Promise.reject()
    // })
    //   return isSize

    //   //如果大于1兆就300kb
    //   console.log('file.sizefile.size',file.size);
    //   if (file.size / 1024  >300) {
    //     return new Promise((resolve,reject) => {
    //       // 压缩到200KB,这里的200就是要压缩的大小,可自定义
    //       imageConversion.compressAccurately(file,
    //       {
    //         // 压缩后的图像大小为100kb
    //         size: 100,
    //         // 图像压缩尺寸的精度，范围0.8-0.99，默认为0.95;
    //         // 这意味着如果图片大小设置为1000Kb，精度为0.9，则认为压缩结果为900Kb-1100Kb的图像是可接受的;
    //         accuracy: 0.9,
    //         type: "image/jpeg",
    //         // width: 300,
    //         // height: 200,
    //         orientation:2,
    //         scale: 0.5,
    //       }).then(res => {
    //         // this.$modal.loading("正在上传图片，请稍候...");
    //         // this.number++;
    //         console.log(res)
    //         resolve(res);
    //       }).catch(() => {
    //         this.loading = false
    //         this.$message.error('图片压缩失败，请联系管理员进行查看！')
    //         reject()
    //       });
    //     })
    //   }else{
    //     // this.$modal.loading("正在上传图片，请稍候...");
    //     // this.number++;
    //   }
    // },

    handleBeforeUpload(file) {
        let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      // 先检查图片格式是否正确
      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }

      // 检查图片大小
      // if (this.fileSize && file.size / 1024 > this.fileSize) {
      //   this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} KB!`);
      //   return false;
      // }

      // 检查图片分辨率
      const isSizePromise = new Promise((resolve, reject) => {
        const _url = URL.createObjectURL(file);
        const img = new Image();

        img.onload = () => {
          const isValidResolution = img.width <= 1920 && img.height <= 1920;
          if(!isValidResolution){
            this.$message.error('上传头像图片分辨率不能大于1920*1920')
          }
          isValidResolution ? resolve() : reject();
        };

        img.onerror = () => reject();

        img.src = _url;
      });

      // 在图片大小和分辨率都符合要求的情况下进行压缩
      // console.log('aaaaa',file);
      isSizePromise
        .then(() => {
          if (file.size / 1024 > 300) {
            return new Promise((resolve, reject) => {
              imageConversion
                .compressAccurately(file, {
                  size: 100,
                  accuracy: 0.9,
                  type: "image/jpeg",
                  // width: 300,
                  // height: 200,
                  orientation: 2,
                  scale: 0.5,
                })
                .then((res) => {
                  this.$modal.loading("正在上传图片，请稍候...");
                  this.number++;
                  // console.log('res,res',res);
                  resolve(res);
                })
                .catch(() => {
                  this.$message.error("图片压缩失败，请联系管理员进行查看！");
                  reject();
                });
            });
          } else {
            // 如果图片大小小于等于300KB，不需要压缩，直接返回true准备上传
            this.number++;
            resolve(true);
          }
        })
        .catch(() => {
          this.$modal.closeLoading();
          return Promise.reject();
        });

      return isSizePromise;
    },

    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.fileName, url: res.url });
        this.uploadedSuccessfully(file);
        this.$modal.closeLoading();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully(file);
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.fileName.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList), this.fileName);
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully(file) {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.fileList.forEach((item) => {
          this.fileName.push(item.name);
        });
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList), this.fileName);
        this.$modal.closeLoading();
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url.replace(this.baseUrl, "") + separator;
        }
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

